Cover of the book Symfony 5: The Fast Track

Symfony 5: The Fast Track is the best book to learn modern Symfony development, from zero to production. +300 pages showcasing Symfony with Docker, APIs, queues & async tasks, Webpack, SPAs, etc.

If you have found a security issue in Symfony, please send the details to security [at] symfony.com and don't disclose it publicly until we can provide a fix for it.
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CVE-2020-15094: Prevent RCE when calling untrusted remote with CachingHttpClient

CVE-2020-15094 fixes an issue to prevent RCE when calling untrusted remote with CachingHttpClient

CVE-2020-5275: All "access_control" rules are required when a firewall uses the unanimous strategy

CVE-2020-5275 fixes an issue preventing all rules set in "access_control" to be checked when a firewall is configured with the unanimous strategy

CVE-2020-5255: Prevent cache poisoning via a Response Content-Type header

CVE-2020-5255 fixes a cache poisoning issue via a Response Content-Type header

CVE-2020-5274: Fix Exception message escaping rendered by ErrorHandler

CVE-2020-5274 fixes Exception message escaping rendered by ErrorHandler.

CVE-2019-11325: Fix escaping of strings in VarExporter

CVE-2019-11325 fixes an issue where some strings were not properly escaped while dumping, leading to possible remote code execution.

CVE-2019-18888: Prevent argument injection in a MimeTypeGuesser

CVE-2019-18888 fixes an issue where provided file paths to the MimeTypeGuesser were not properly escaped before being executed.

CVE-2019-18886: Prevent user enumeration using switch user functionality

CVE-2019-18886 fixes an issue where one could enumerate users using the switch user functionality as different behaviour would occur when a user existed compared to when a user did not

CVE-2019-18887: Use constant time comparison in UriSigner

CVE-2019-18887 fixes an issue where one could guess the signature of an URI using a remote timing attack.

CVE-2019-18889: Forbid serializing AbstractAdapter and TagAwareAdapter instances

CVE-2019-18889 fixes an issue where the destructor of TagAwareAdapter execute callables stored in properties, leading to possible remote code execution when an external payload is unserialized.

CVE-2019-10909: Escape validation messages in the PHP templating engine

CVE-2019-10909 fixes an issue where when using the form theme of the PHP templating engine validation messages were not correctly escaped.